optional argument: new email address
Without arguments, this command will print your current electric mail
address. With arguments, this sets a new electric mail address for you.
Setting your e-mail address makes such things as lost password retrieval
much simpler should the need ever arise.
NOTE: Only Archwizards and above can see this address, and it will not
be given out to others or sold, so you do not need to worry about
receiving unnecessary spam mail due to listing your address here.
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